Duplex technology is simple, affordable, and astonishingly effective.

SCR Performance at a fraction of the cost.

In recent years, combustion system owners and operators have relied on Selective Catalytic Reduction (SCR) as well as Low NOx burners (LNB) and Ultra-Low NOx burners (ULNB) to reduce emissions. Unfortunately, each of these options introduce operational and financial challenges. For example, SCR’s are highly capital intensive, sometimes costing many millions of dollars in acquisition, infrastructure and operational costs to accommodate and support the needed systems. As for ULNB and LNB’s such systems use long flame length to cool flame temperatures to combat NOx formation. Such long flames can impinge upon the surface of the process tubes degrading performance and requiring additional maintenance and production interruptions.

Duplex eliminates potential flame impingement.

Duplex essentially turns a single large and unruly flame into thousands of tiny, more easily controlled flames. Duplex burner architecture controls and reduces flame length and offers a number of potential improvements to operations, including:

Duplex is the most capable and beneficial combustion technology on the market.

The secret of Duplex technology lies in the thousands of small chambers that make up a Duplex tile. Each holds a tiny flame burning with far more efficiency than a single large flame.

The result is a more efficient radiant heat profile that eases stress on burner parts while improving combustion efficiency and increasing maximum throughput potential.

The Duplex tiles radiate uniform heat. The roar of the turbulent flame becomes a whisper and harmful gases and particulates are prevented from ever forming in the first place.

Applications

ClearSign’s technologies can be applied to virtually any system in which there is a flame. Our solutions enable cost-effective retrofitting onto existing, standard system designs to simultaneously improve both their energy efficiency and pollution control characteristics. ECC™ and/or Duplex™ Technologies offer clear and measurable advantages relative to competing technologies and address unmet market needs across each industrial combustion market:

Environmental regulations for the refining industry are getting tighter and more difficult to achieve without compromising operations. The implementation of environmental controls, either at the combustion source or post-combustion, have many undesirable limitations that impose considerable economic costs, primarily related to the reduction in nominal furnace capacity. ClearSign has calculated that potential gains in refinery profitability could be $12 – $28 million per year for an average 100,000 bpd refinery could be achieved by eliminating the bottlenecks caused by conventional NOx control technology in crude heaters alone.

ClearSign estimates there are 34,000 large commercial and industrial firetube boilers installed in the US alone today, averaging 21 MMBtu/h each — some 60% of which are located in air quality ‘non-attainment’ regions. Many of these systems in non-attainment regions are required to emit no more than 9PPM of NOx with other regions requiring no more than 5PPM (with the rest of the country expected to follow). To reach 9ppm NOx today, these systems must be modified with a combination of Ultra-Low NOx burners (ULNBs), External Flue Gas Recirculation (EFGR) and systems to control and monitor their performance. To reach 5ppm, either the entire boiler burner system needs to be replaced, or a Selective Catalytic Reduction (SCR) system must be added. The 5-year cost of ownership of these SCR systems ranges from between $300,000 to over $600,000 for each of the tens of thousands of boilers impacted.